Created by: lcy-seso

The indentation for the license is not unified. What is the correct indentation, and should we unified it.

We have indentation like in this file: https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/operators/accuracy_op.h

and we also have this: https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/operators/cast_op.cc